O.S. Engines 46LA-S User Manual
It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-6 of this booklet and to strictly
adhere to the advice contained therein.
●
Also, please study the entire contents of this
instruction manual, so as to familiarize yourself
with the controls and other features of the
engine.
●
Keep these instructions in a safe place so that
you may readily refer to them whenever
necessary.
●
It is suggested that any instructions supplied
with the aircraft, radio control equipment, etc.,
are accessible for checking at the same time.
CONTENTS
SAFETY INSTRUCTIONS AND WARNINGS
ABOUT YOUR O.S. ENGINE
INTRODUCTION
INSTALLATION OF THE ENGINE
INSTALLATION OF SILENCER
NEEDLE-VALVE LOCATION
BEFORE STARTING
PLUMBING AND
FUEL TANK POSITION
ADVICE ON SELECTION OF FUEL,
GLOW PLUG & PROPELLER
10
14
2~6
9
~
~
~
10
12
12
22
STAR TING THE ENGINE
7
8
9
RUNNING-IN (Breaking-in)
TROUBLE SHOOTING WHEN THE
ENGINE FAILS TO START
CARE AND MAINTENANCE
ENGINE EXPLODED VIEW &
PARTS LIST
THREE VIEW DRAWING
OPTIONAL PARTS & ACCESSORIES
1
14
~
20
20
~
22
21
23
24
~
27
28~29
30
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
Remember that your engine is not a "toy", but a highly efficient internalcombustion machine whose power is capable of harming you, or others, if it is
misused.
As owner, you, alone, are responsible for the safe operation of your engine, so act
with discretion and care at all times.
If at some future date, your O.S. engine is acquired by another person, we would
respectfully request that these instructions are also passed on to its new owner.
The advice which follows is grouped under two headings according to the
degree of damage or danger which might arise through misuse or neglect.
WARNINGS
These cover events which
might involve serious (in
extreme circumstances, even
fatal) injury.
NOTES
These cover the many other
possibilities, generally less obvious
sources of danger, but which, under
certain circumstances, may also
cause damage or injury.
2
WARNINGS
Never touch, or allow any object to come
•
into contact with, the rotating
propeller and do not crouch
over the engine when it is
running.
A weakened or loose propeller may
•
disintegrate or be thrown off and, since
propeller tip speeds with powerful
engines may exceed 600 feet(180 metres)
per second, it will be understood that
such a failure could result in serious
injury, (see 'NOTES' section relating to
propeller safety).
Model engine fuel is poisonous. Do not
•
allow it to come into contact with the eyes
or mouth. Always store it in a
clearly marked container and
out of the reach of children.
Model engine fuel is also highly
•
flammable. Keep it away from open flame,
excessive heat, sources of sparks, or
anything else which might ignite
it. Do not smoke or allow anyone
else to smoke, near to it.
•
Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. Run your engine only in an
open area.
Model engines generate considerable
•
heat. Do not touch any part of your
engine until it has cooled. Contact with
the muffler (silencer),
cylinder head or exhaust
header pipe, in particular,
may result in a serious burn.
3
NOTES
This engine was designed for model
•
aircraft. Do not attempt to use it for any
other purpose.
Mount the engine in your model securely,
•
following the manufacturers' recommendations, using appropriate screws and locknuts.
Be sure to use the silencer (muffler)
•
supplied with the engine. Frequent
exposure to an open exhaust may
eventually impair your hearing.
Such noise is also likely to cause
annoyance to others over a wide area.
If you remove the glowplug from the engine
•
and check its condition by connecting the
battery leads to it, do not hold the plug with
bare fingers.Use an appropriate tool or a
folded piece of cloth.
Fit a top-quality propeller of the diameter
•
and pitch specified for the engine and
aircraft. Locate the propeller on the shaft so
that the curved face of the blades faces
forward-i.e. in the direction of flight. Firmly
tighten the propeller nut, using the correct
size wrench.
4
NOTES
Always check the tightness of the propeller
•
nut and retighten it, if necessary, before
restarting the engine, particularly in the
case of four-stroke-cycle engines. If a
safety locknut assembly is provided with
your engine, always use it. This will prevent
the propeller from flying off in the event of a
"backfire", even if it loosens.
If you fit a spinner, make sure that it is a
•
precision made product and that the slots
for the propeller blades do not cut into the
blade roots and weaken them.
Preferably, use an electric starter. The
•
wearing of safety glasses is also strongly
recommended.
Discard any propeller which has become
•
split, cracked, nicked or otherwise rendered
unsafe. Never attempt to repair such a
propeller: destroy it. Do not modify a propeller
in any way, unless you are highly experienced
in tuning propellers for specialized
competition work such as pylon-racing.
Take care that the glow plug clip or battery
•
leads do not come into contact with the
propeller. Also check the linkage to the
throttle arm. A disconnected linkage could
also foul the propeller.
After starting the engine, carry out any
•
needle-valve readjustments from a safe
position behind the rotating propeller. Stop
the engine before attempting to make other
adjustments to the carburettor.
5
NOTES
Adjust the throttle linkage so that the engine
•
stops when the throttle stick and trim lever
on the transmitter are fully retarded.
Alternatively, the engine may be stopped by
cutting off the fuel supply. Never try to stop
the engine physically.
Take care that loose clothing (ties, shirt
•
sleeves, scarves, etc.)do not come into
contact with the propeller.Do not carry loose
objects (such as pencils, screwdrivers, etc.)
in a shirt pocket from where they could fall
through the propeller arc.
Do not start your engine in an area
•
containing loose gravel or sand.
The propeller may throw such material in
your face and eyes and cause injury.
For their safety, keep all onlookers
•
(especially small children) well back (at
least 20 feet or 6 meters) when preparing
your model for flight. If you have to carry
the model to the take-off point with the
engine running, be especially cautious.
Keep the propeller pointed away from you
and walk well clear of spectators.
Warning! Immediately after a glowplug-
•
ignition engine has been run and is still
warm, conditions sometimes exist whereby
it is just possible for the engine to abruptly
restart if the propeller is casually flipped
over compression WITHOUT the glowplug
battery being reconnected. Remember this
if you wish to avoid the risk of a painfully
rapped knuckle!
6
INTRODUCTION
The "LA-S Series" engines are designed for control line
models. They have broad power characteristics which
are suitable for both trainer models and stunt models.
A separate needle-valve is mounted at the rear, where
manual adjustment is safely away from the rotating
propeller.
The 'midnight blue' external finish may be
decolorized by very high surface temperature or
by certain solvents. Such decolorization does not
affect engine perfor-mance, however.
Connect the short length of fuel tubing supplied
securely between the fuel outlet and the fuel inlet. In
the event of the tube becoming damaged, it should be
replaced with a suitable length of best quality 5mm
ODX2mm ID silicone tubing. Use similar material to
connect the fuel inlet nipple to the fuel tank.
Length
~
15LA-S
25LA-S
40/46LA-S
52mm
51
~
56mm
55
~
66mm
65
7
Cylinder head
Venturi
Propeller nut
Crankshaft
Fuel inlet
Drive Hub
Propeller washer
Glowplug
Fuel outlet
Needle valve
Cover Plate
Silicone Tube
Crankcase
INSTALLATION
Installation in the model
A typical method of beam
mounting is shown below,left.
At least
12mm(1/2")
At least
12mm(1/2")
Make sure that the mounting beams are parallel
and that their top surfaces are in the same plane.
CORRECT
O.S. radial motor mount
(Available as an optional extra part.
See parts list)
Rigid hardwood
(e.g. maple)
INCORRECT
How to fasten the mounting screws.
Tighten second nut firmly
3mm steel nuts
Spring washer or
lock washer
down onto first nut.
Tighten this nut first.
Steel washer
3mm steel screw
Hardwood mounting beams
3mm steel Allen screw
Spring washer
Hardwood such as
cherry or maple.
Front view
Side view
Top surfaces are in the
same plane.
Top surfaces are not
in the same plane.
Re-align the surfaces
as necessary
Opposite beam
Top surfaces
are not in the
same plane.
Engine does
not seat firmly.
O.S. radial motor mount
(cast aluminum)
8
NEEDLE-VALVE EXTENSION
The needle-valve supplied with these engines is
designed to incorporate an extension so that, when
the engine is enclosed within the fuselage, the
needle-valve may be adjusted from the outside.
Cut a commercially available rod to the required
length, bend one end to an L shape, insert it into
needle's center hole and secure it by tightening the
set-screw in the needle-valve knob with 1.5mm. Allen
key.
INSTALLATION OF SILENCER
The angled exhaust of the silencer can be rotated to
any desired position in the following manner:
1) Loosen the locknut and assembly screw.
2) Set the exhaust outlet at the required position by
rotating the rear part of the silencer.
3) Re-tighten the assembly screw, followed by the
locknut. The standard silencer is quite effective but
reduces power to some degree.
Assembly screw
Exhaust pressure nipple
Reminder!
Model engines generate considerable heat. Do
not touch any part of your engine until it has
cooled. Contact with the muffler (silencer),
cylinder head or exhaust header pipe, in
particular, may result in a serious burn.
Cone baffle
Turn to requlred position
Exhaust outlet
NEEDLE-VALVE LOCATION
As delivered from the factory, the MAX-40LA & 46LA
have the needle-valve assembly installed vertically.
However, if more convenient for a particular
installation, the needle-valve may be reinstalled
horizontally.
The procedure for relocating the needle-valve is as
follows:
9
Locknut
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